.card-number {
  display: block;
  position: absolute;
  width: 48px;
  height: 48px;
  text-align: center;
  line-height: 48px;
  top: 24px;
  left: 24px;
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  border-radius: 50%;
  background: rgba(9, 9, 9, 0.25);
  color: white;
  text-shadow: 0 0 3px black;
  transition: all 0.5s ease;
  font-size: 20px;
  font-weight: bold;
}